package com.batatas.util;

import javax.servlet.http.HttpServletRequest;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.session.Session;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import com.batatas.platform.entity.pub.ManagerEntity;

public class SessionUtil
{
	/**
	 * 用户信息key
	 */
	public static final String USER_SESSION_KEY = "USER_SESSION_KEY";
	public static final String USER_SESSION_LOGOUT_LOGOUT_KEY = "USER_SESSION_LOGOUT_LOGOUT_KEY";

	/**
	 * 从session中获取当前登录的用户信息
	 * 
	 * @return[参数、异常说明] @return UserForm [返回类型说明]
	 * @see [类、类#方法、类#成员]
	 */
	public static ManagerEntity getSession()
	{
		Session session = SecurityUtils.getSubject().getSession();
		return (ManagerEntity) session.getAttribute(USER_SESSION_KEY);
	}

	/**
	 * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址,
	 * 
	 * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？
	 * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
	 * 
	 * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,
	 * 192.168.1.100
	 * 
	 * 用户真实IP为： 192.168.1.110
	 * 
	 * @param request
	 * @return
	 */
	public static String getIpAddress()
	{
		HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
		String ip = request.getHeader("x-forwarded-for");
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))
		{
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))
		{
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))
		{
			ip = request.getHeader("HTTP_CLIENT_IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))
		{
			ip = request.getHeader("HTTP_X_FORWARDED_FOR");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))
		{
			ip = request.getRemoteAddr();
		}
		return ip;
	}

}
